[root@localhost robbins876]# yum update
Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
not using ftp, http[s], or file for repos, skipping - database is locked
not using ftp, http[s], or file for repos, skipping - Query: SELECT url FROM mirrors where repo="core-6" and arch="i386" and valid="1" and country='US';
Error: Cannot find a valid baseurl for repo: core